ACD320 user manual Appendix
- 133-
words)
For example: for an inverter with the slave address of 01H, the start address of memory is
0004, ready consecutive two words, the structure of the frame is as follows:
RTU Command Message of the Master
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR 01H
CMD 03H
Higher bits of start address 00H
Lower bits of start address 04H
Higher bits of data number 00H
Lower bits of data number 02H
CRC CHK lower bit 85H
CRC CHK higher bit CAH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU Response Message of the Slave
START T1-T2-T3-T4(transmission time of 3.5 bytes)
ADDR 01H
CMD 03H
byte number 04H
Higher bits of data address
0004H
00H
Lower bits of data address
0004H
00H
Higher bits of data address
0005H
00H
Lower bits of data address
0005H
00H
CRC CHK lower bit FAH
CRC CHK higher bit 33H
END T1-T2-T3-T4（transmission time of 3.5 bytes）
ASCII Command Message of the Master
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